getting metered, need tips&tricks

Scarrell · Post by **Scarrell** » Tue Mar 07, 2006 7:34 pm

well im getting the Type R metered tomorrow... the shop uses the new Audio Control mic, so not sure what the difference between it and the TermLab are, but ohwell, anyway.. just mostly wanting some tips and tricks for getting the highest number.. this isnt a competition or nothin.. its only $10 so i figured what the hay.. i plan on using the Power Tools cd from Bass Mechanic, which has tones down the tenths, so i can go to 35.2hz to 35.4hz..etc.... umm.. i plan on having the car running ofcourse, heater off.. um.. again my sub is a 12" Type R in a 3cf box tuned to 30hz.. using a JBL 600.1 at 2ohms,(tryin to give as much info as possible).. but i guess thats it.. any more info needed then ask..

Bwcad1 · Post by **Bwcad1** » Tue Mar 07, 2006 7:38 pm

well your best bet is to just figure out what your tone is and burp it. if the meter is on the dash on the passenger side open the driver door. or have them meter it in the kick panel passanger side and open the drivers door. if your box is tuned to 30 then you want to play around 33-37 hz im gonna say is gonna be your loudest. the audio control will be high by about .5 to 1 db over a tl good luck also put your port on the oposite side of the meter.

William from NOLA · Post by **William from NOLA** » Tue Mar 07, 2006 7:47 pm

You'll never know what the loudest frequency will be. Mine was 42 Hz with a box tuned to 30 Hz. The excursion curve showed it peaking around there too.

The 3 Hz rule really only works above 40 Hz tunings and progressivly gets smaller through 60 Hz.

Ryan from Ohio · Post by **Ryan from Ohio** » Tue Mar 07, 2006 7:50 pm

Actuall the Power Tools CD 2nd disk is just in 1 Hz incriments for the bass sector.

I got it, excellent CD!

Bwcad1 · Post by **Bwcad1** » Tue Mar 07, 2006 7:59 pm

what you really need to do is play a sweep and have them give you your freq. and i belive you will actually have two peaks the box peak and the vehicle peak.

William from NOLA · Post by **William from NOLA** » Tue Mar 07, 2006 8:01 pm

Bwcad1 wrote:what you really need to do is play a sweep and have them give you your freq. and i belive you will actually have two peaks the box peak and the vehicle peak.

Yea, but only the vehicle peak is what you will find unless you stick the meter in the port of the box.

Scarrell · Post by **Scarrell** » Tue Mar 07, 2006 8:52 pm

thanks for all the tips guys, keep em coming... i will also be using my camera to take pics and vid.

Bwcad1 · Post by **Bwcad1** » Wed Mar 08, 2006 5:07 am

thats right to a point. will in my experiance i have 2 peaks on that is from my box and one from my vehicle 48hz and 54hz respectivly. but im still louder at 48 than 54. well at least thats what most spl guys have found.

William from NOLA · Post by **William from NOLA** » Wed Mar 08, 2006 9:07 am

Yea, there at least two peaks, but when you combine the two, it tends to be more of what the enclosure dictates rather than the car. You want the enclosure to be assisted by the car is the goal.

To find your car's transfer function, you need a sub in a box with a pretty flat response and record every measurement at each frequency. Then get the same sub metered in a large open room. Subtract the difference at each frequency and you'll find the transfer function for the car.

Scarrell · Post by **Scarrell** » Wed Mar 08, 2006 6:26 pm

147.9!!!!!!!!!!!!!!!!, yay.. got a 147.9 on the dash, alot more than i expected.. i got video of it, but only of when i was hitting 147.2 playing tones, i hit the 147.9 using a 20hz-60hz tone i got off of ROE.. but still awesome!, will post vid soon.